Buggy code:
public class FileUtils { public FileUtils ( ) { } public static final long ONE_KB = 1024 ; public static final long ONE_MB = ( FileUtils . ONE_KB ) * ( FileUtils . ONE_KB ) ; public static final long ONE_GB = ( FileUtils . ONE_KB ) * ( FileUtils . ONE_MB ) ; public static final File [ ] EMPTY_FILE_ARRAY = new File [ 0 ] ; public static FileInputStream openInputStream ( File file ) throws IOException { } public static FileOutputStream openOutputStream ( File file ) throws IOException { if ( file . exists ( ) ) { if ( file . isDirectory ( ) ) { throw new IOException ( ( ( "File<seq2seq4repair_space>'" + file ) + "'<seq2seq4repair_space>exists<seq2seq4repair_space>but<seq2seq4repair_space>is<seq2seq4repair_space>a<seq2seq4repair_space>directory" ) ) ; } if ( ( file . canWrite ( ) ) == false ) { throw new IOException ( ( ( "File<seq2seq4repair_space>'" + file ) + "'<seq2seq4repair_space>cannot<seq2seq4repair_space>be<seq2seq4repair_space>written<seq2seq4repair_space>to" ) ) ; } } else { File parent = file . getParentFile ( ) ; <START_BUG> if ( ( parent . exists ( ) ) == false ) { <END_BUG> if ( ( parent . mkdirs ( ) ) == false ) { throw new IOException ( ( ( "File<seq2seq4repair_space>'" + file ) + "'<seq2seq4repair_space>could<seq2seq4repair_space>not<seq2seq4repair_space>be<seq2seq4repair_space>created" ) ) ; } } } return new FileOutputStream ( file ) ; } public static String byteCountToDisplaySize ( long size ) { } public static void touch ( File file ) throws IOException { } public static File [ ] convertFileCollectionToFileArray ( Collection files ) { } private static void innerListFiles ( Collection files , File directory , IOFileFilter filter ) { } public static Collection listFiles ( File directory , IOFileFilter fileFilter , IOFileFilter dirFilter ) { } public static Iterator iterateFiles ( File directory , IOFileFilter fileFilter , IOFileFilter dirFilter ) { } private static String [ ] toSuffixes ( String [ ] extensions ) { } public static Collection listFiles ( File directory , String [ ] extensions , boolean recursive ) { } public static Iterator iterateFiles ( File directory , String [ ] extensions , boolean recursive ) { } public static boolean contentEquals ( File file1 , File file2 ) throws IOException { } public static File toFile ( URL url ) { } public static File [ ] toFiles ( URL [ ] urls ) { } public static URL [ ] toURLs ( File [ ] files ) throws IOException { } public static void copyFileToDirectory ( File srcFile , File destDir ) throws IOException { } public static void copyFileToDirectory ( File srcFile , File destDir , boolean preserveFileDate ) throws IOException { } public static void copyFile ( File srcFile , File destFile ) throws IOException { } public static void copyFile ( File srcFile , File destFile , boolean preserveFileDate ) throws IOException { } private static void doCopyFile ( File srcFile , File destFile , boolean preserveFileDate ) throws IOException { } public static void copyDirectoryToDirectory ( File srcDir , File destDir ) throws IOException { } public static void copyDirectory ( File srcDir , File destDir ) throws IOException { } public static void copyDirectory ( File srcDir , File destDir , boolean preserveFileDate ) throws IOException { } private static void doCopyDirectory ( File srcDir , File destDir , boolean preserveFileDate ) throws IOException { } public static void copyURLToFile ( URL source , File destination ) throws IOException { } public static void deleteDirectory ( File directory ) throws IOException { } public static void cleanDirectory ( File directory ) throws IOException { } public static boolean waitFor ( File file , int seconds ) { } public static String readFileToString ( File file , String encoding ) throws IOException { } public String readFileToString ( File file ) throws IOException { } public static byte [ ] readFileToByteArray ( File file ) throws IOException { } public static List readLines ( File file , String encoding ) throws IOException { } public static List readLines ( File file ) throws IOException { } public static LineIterator lineIterator ( File file , String encoding ) throws IOException { } public static LineIterator lineIterator ( File file ) throws IOException { } public static void writeStringToFile ( File file , String data , String encoding ) throws IOException { } public static void writeStringToFile ( File file , String data ) throws IOException { } public static void writeByteArrayToFile ( File file , byte [ ] data ) throws IOException { } public static void writeLines ( File file , String encoding , Collection lines ) throws IOException { } public static void writeLines ( File file , Collection lines ) throws IOException { } public static void writeLines ( File file , String encoding , Collection lines , String lineEnding ) throws IOException { } public static void writeLines ( File file , Collection lines , String lineEnding ) throws IOException { } public static void forceDelete ( File file ) throws IOException { } public static void forceDeleteOnExit ( File file ) throws IOException { } private static void deleteDirectoryOnExit ( File directory ) throws IOException { } private static void cleanDirectoryOnExit ( File directory ) throws IOException { } public static void forceMkdir ( File directory ) throws IOException { } public static long sizeOfDirectory ( File directory ) { } public static boolean isFileNewer ( File file , File reference ) { } public static boolean isFileNewer ( File file , Date date ) { } public static boolean isFileNewer ( File file , long timeMillis ) { } public static boolean isFileOlder ( File file , File reference ) { } public static boolean isFileOlder ( File file , Date date ) { } public static boolean isFileOlder ( File file , long timeMillis ) { } public static long checksumCRC32 ( File file ) throws IOException { } public static Checksum checksum ( File file , Checksum checksum ) throws IOException { }

Fix:
if ( ( parent != null ) && ( ( parent . exists ( ) ) == false ) ) {